IFFWOL (HLI function)
Summary
- Description
- The IFFWOL call (FIND WITHOUT LOCKS) selects records from a Model 204 file or group without obtaining record locks and creates a found set.
- Thread type
- multiple cursor IFSTRT, single cursor IFSTRT
- IFCALL function number
- 87
Syntax
IFFWOL|IFFWO(RETCODE,FIND_SPEC,FWOL_NAME,%VARBUF,%VARSPEC)
- Compile-only form
- IFCALL function number: 88
IFFWOLC|IFFWOC(RETCODE,FIND_SPEC,FWOL_NAME)
- Execute-only form
- IFCALL function number: 89
IFFWOLE|IFFWOE(RETCODE,FWOL_NAME,%VARBUF,%VARSPEC)
Specify the parameters in the syntax order shown above.
| Parameter | Description |
|---|---|
| RETCODE | [O,i,r] The Model 204 return code is the required first parameter. The code is a binary integer value. |
| FIND_SPEC | [I,c,r] The find specification is a required input parameter that is the selection criteria to be used for retrieving records. Specify the selection criteria as a character string.
See FIND_SPEC for a detailed description of the find specification used for IFFIND that is also valid for IFFWOL. |
| FWOL_NAME | [I,s,r/o] The name of the IFFWOL compilation is an input parameter that is required for use with a multiple cursor IFSTRT thread. It is only required for a single cursor IFSTRT thread if using the Compiled IFAM facility (IFFWOLC and IFFWOLE). Model 204 saves the compilation using this name.
Specify the name as unique and as a short character string (maximum 32 characters).
Note: A null value is equivalent to omitting the name parameter and is not valid for a multiple cursor thread. |
| %VARBUF | [I,c,o] The variable buffer is an optional input parameter that addresses a data area, which accommodates up to 255 bytes of data per value. The buffer contains values that are defined by the %VARSPEC parameter, below, to be assigned to %variables. Specify a character string. For information about %variables, see Using variables and values in computation. |
| %VARSPEC | [I,c,o] The variable specification describes the format of the data that is contained in the %VARBUF parameter and lists the %variables to be assigned. %VARSPEC specifies the contents of the variable buffer, described above. Specify a character string which follows a LIST, DATA, or EDIT syntax.
%VARSPEC is a required input parameter if %VARBUF is specified. |
Usage notes
Use the IFFWOL call to retrieve records without locks. The find specification is based on a specified combination of retrieval conditions and is identical to the one that is used with the IFFIND call.
Completion return code (RETCODE)
A completion code of 4 indicates an IFFWOL error. If the IFFWOL call is unsuccessful, Model 204 returns a completion code of 4 for the following error conditions:
- An error in an IFFWOL specification. Note that Model 204 does not save the compilation and does not define the compilation name.
- A field name variable is replaced by a non-existent field. In this case, Model 204 does not execute the IFFWOL, but it does save the compilation if the name parameter is specified.
- An error is encountered in a %variable parameter.
Coding example (COBOL)
WORKING-STORAGE SECTION. 01 CALL-ARGS. 05 RETCODE PIC 9(5) COMP SYNC. 05 QUAL-1 PIC X(75) VALUE 'SEX=FEMALE; OCCUPATION=DOCTOR OR DENTIST; CITY=BOSTON;NAME LIKE "PAT*";END;'. . . . PROCEDURE DIVISION. . . . CALL "IFFWOL" USING RETCODE, QUAL-1.